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Asked: 2026-05-16T11:00:49+00:00

As the title states, I have a C# console app which uses interop to

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As the title states, I have a C# console app which uses interop to open Excel and create a new workbook. The code works fine when running the console app via command line. However this exception is thrown when running the console app via a scheduled task:

System.UnauthorizedAccessException: Retrieving the COM class factory for component   with CLSID {00024500-0000-0000-C000-000000000046} failed due to the following error: 80070005

It is thrown from the following call:

_xlApp = new Excel.Application()

The scheduled task is setup to use my credentials (I am an administrator). Based on other forums I have made sure I have granted full control to my account at Component Services –> Computers –> My Computer –> DCom Config –> Microsoft Excel Application, but no luck.

I’m on Windows 7 Enterprise 64 bit. Not sure what the next step should be, any help is appreciated

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1 Answer

  1. Editorial Team

    I ended up writing a windows service to call out to a library containing the Excel generation code. That fixed the error. However there was another COM exception when calling the workbook.Save() method. No matter what I tried that error would not go away. I read another post which stated that this was a security precaution and therefore by design.

    However, calling workbook.SaveAs() will produce the same result and works fine when called from a windows service.

    Thanks for the input funkymushroom. Hopefully this post will be helpful to someone else struggling with Excel Interop automation.

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